Design some cards for `Getting started` pages

[stephanie-anderson]

Description

I would love something like this for our SDK getting started pages:

Source: https://dribbble.com/shots/16471628-Welcome-Modal

But I do think it would be great to also be able to provide a little bit of text in each box (aside from the page title).

So in our case it would be:

• header (PRODUCT WALKTHROUGH in the card above)
• title (Onboarding in the card above)
• description (missing in the card above)

Given any SDK getting started page, a card could look like:

• header: SET UP
• title: Error Monitoring
• description: Learn how to automatically capture errors in your application.